This OVA is released as a bonus OAB included with the limited edition of the original novel "Ascendance of a Bookworm: I'll do anything to become a librarian ~ Part 5: The Goddess's Incarnation I". Supervised by the original author Miya Kazuki, it tells a story set between the first and second seasons of the TV anime. "Side Story Chapter 1: Justus's Great Downtown Infiltration Operation" (Original story included in "Part 3: The Adopted Daughter of a Lord II") Justus and Eckhart, close aides to Ferdinand, are ordered by Ferdinand to investigate the circumstances surrounding Myne, who is set to become a blue shrine maiden apprentice. Justus, whose hobby is gathering information and who doesn't mind cross-dressing, is highly motivated. Meanwhile, Eckhart is overwhelmed by the smells of the lower city and is down for the count. Will the two of them be able to gather information on Myne in the lower city!? "Side Story Chapter 2: Lady Corinna's Home Visit" (Original story included in "Part 1: The Soldier's Daughter III") Myne, Tuuli, and Effa visit Corinna's home after being told she wants to see Myne's baptism ceremony dress. Tuuli is overjoyed at the chance to meet her idol, Corinna. Amidst this, Corinna expresses a desire to purchase the rights to a hair ornament, leading to a price negotiation between Myne and Benno. Tuuli is overwhelmed by her first glimpse of 'Merchant Myne'...